Today I was playing a game in which I was assured of victory; my opponent had one piece left of lower rank than mine and was out of moves without being taken. At this point, my opponent proposed a draw, which I declined. After the proposed draw message was declined, it was my opponent's turn, but his timer did not run down. He simply was able to sit there and not make a move until I closed the browser, being credited with a loss. This isn't the first time this has happened.
Is there simply a bug with declining the draw option, or am I doing something wrong?